The collision occurred shortly before 12:30 a.m. Thursday morning on the eastbound 60 Freeway near Nason Street, according to the California Highway Patrol.
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The victim was riding a 2009 Suzuki motorcycle in the No. 2 lane when a black sedan approached from behind "at a high rate of speed," the CHP said in a statement. The car struck the back of the motorcycle, ejecting the rider.
The victim suffered major injuries and was transported to Riverside University Health Systems Hospital, the Highway Patrol said.
A witness who stopped at the scene to help the motorcyclist provided the dashcam video to authorities.
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Anyone with information about the crash is urged to call the CHP's Accident Investigation Unit at (951) 637-8000.